Index: openacs-4/packages/file-storage/www/file-add.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/file-storage/www/file-add.tcl,v
diff -u -r1.17.2.6 -r1.17.2.7
--- openacs-4/packages/file-storage/www/file-add.tcl	29 Jul 2014 11:14:19 -0000	1.17.2.6
+++ openacs-4/packages/file-storage/www/file-add.tcl	31 Jul 2014 08:42:18 -0000	1.17.2.7
@@ -23,10 +23,12 @@
     instructions:onevalue
 } -validate {
     file_id_or_folder_id {
-	if {([info exists file_id] && $file_id ne "") && (![info exists folder_id] || $folder_id eq "")} {
+	if {[info exists file_id] 
+	    && [string is integer -strict $file_id]
+	    && (![info exists folder_id] || $folder_id eq "")} {
 	    set folder_id [db_string get_folder_id "select parent_id as folder_id from cr_items where item_id=:file_id;" -default ""]
 	}
-	if {![fs_folder_p $folder_id]} {
+	if {![string is integer -strict $folder_id] || ![fs_folder_p $folder_id]} {
 	    ad_complain "The specified parent folder is not valid."
 	}
     }